I have the 5 port. I just noticed something else when i was browsing for bearings, it says 6mm for the front bearing on the parts list and on A-main, but i measured my crank and its 7mm ?? I also noticed that on the pictures it looks like there is a seal on both sides of the bearings, but on the ones in my engine there is only one on one side on the front bearing and none on the rear ? is that just something to protect them ?